A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-495-0595
NSN 6130-00-499-3843
NSN 6650-01-487-4566
NSN 5998-01-443-3293
NSN 6105-01-009-1456
NSN 5996-00-790-4758
NSN 6105-00-885-0351
NSN 5975-01-434-7981
NSN 5975-01-039-3949
NSN 6610-01-495-0596
NSN 6685-01-227-2621
NSN 5998-00-330-7060